4.2 Net Ionic Equations

All physical and chemical processes can be represented:

Symbolically by balanced equations

Chemical equations represent:

Chemical changes

Chemical changes are the result of a:

Rearrangement of atoms into new combinations

Any representation of a chemical change must contain ______ before and after the change occurred

Equal numbers of atoms of every element

Why must any representation of a chemical change contain equal numbers of atoms of every element before and after the change occured?

Chemical changes are the result of a rearrangement of atoms into new combinations

Equations demonstrate that ______ is conserved in chemical reactions

Mass

How do equations demonstrate that mass is conserved in chemical reactions?

Any representation of a chemical change contains equal number of atoms of every element before and after the change occurred

A short-hand way to describe the changes that occur in a chemical reaction

Balanced equation

Balanced equations follow the:

Law of conservation of matter/mass

Law of conversation of matter/mass states that:

In any chemical or physical reaction no matter can be created or destroyed

The number of each type of atom is _______ on both sides of the arrow

The same

______ are used to change the number of each particle in the reaction

Coefficients

Can subscripts be changed to balance a chemical equation?

No

We can include the ______ in an equation to provide more information

States of matter

In a physical reaction, only the ______ of an equation change.

States of matter

Symbol for solid:

s

Symbol for liquid:

l

Symbol for gas:

g

Symbol for aqueous solution:

aq

Diatomic elements include:

H2, N2, O2, F2, Cl2, Br2 and I2

Diatomic elements are found in what form in nature?

Diatomic form

Steps for balancing equation:

Write out the equation. Count the atoms on each side of the equation. Compare the counts, if they are the same then stop, if they are different then continue. Change a coefficient to make one element correct Recount the atoms. Compare the counts, if they are the same then stop, if different return to change another coefficient and repeat the process.

Differing symbolic forms used to represent a chemical reaction:

Balanced molecular, complete ionic, and net ionic equations

The form used to represent the reaction depends on:

The context in which it is to be used

When you have mastered writing a balanced equation you can then write an:

Overall ionic equation

Overall ionic equations show how:

Ionic compounds dissociate into their ions when they dissolve in water

If you have solutions of ______ they should be written as their ions if you are showing an overall ionic equation

An ionic compound (particularly any sodium, potassium, ammonium, and nitrate salts)

Substances that are ______ will have to be written as their ions when showing overall ionic equation

Aqueous and ionic, strong acids and bases

Precipitation reactions are a form of:

Double ionic replacement reactions

Precipitation reactions follow the format of:

AB + CD → AD + CB

What happens during double ionic replacement reactions?

Positive and negative ions switch partners

Substances that are ______ will not be written as their ions when showing overall ionic equation

Nonionic, weak acid and bases

The net ionic equation only shows:

The particles that change in the reaction

The net ionic equation cancels out the:

Spectator ion

An ion that isn’t involved in the reaction and stays the same phase throughout

Spectator ion